Protest organiser Sean Power said he was "delighted" with the turnout
Thousands lined the sides of a proposed new finance centre in St Helier in protest at its development.
The development on the Esplande Car Park, by government-owned Jersey Development Company, will consist of six buildings and a car park.
A group including a festival organiser, a former politician and former journalist organised the protest.
Treasury Minister, Senator Alan Maclean, has said campaigns against the project were costing the island money.
There were up to 3,000 people at the protest from a range of ages and backgrounds.
People from a range of backgrounds and age groups turned out to protest
Sandy (left) said he supported the finance industry but did not believe the government should be building the site
Former politician and organiser Sean Power said he was delighted with the turnout and hoped the developers would sit up and pay attention.
He said: "I was emotional actually, even though I must have looked like a clown on a bike with a megaphone.
"There was a lot of passion here, people felt they weren't being listened to and hopefully now they will sit up and pay attention."
Signs saying "no" were handed to people as they arrived and were held up around the site
Up to 3,000 people are thought to have turned out for the protest
Jersey Live festival director, Warren Le Sueur, was also involved in the protest and said as public land the site should be cleared and turned into an open space.
"It has superseded what everyone thought it was going to be like. I think the people hoping to develop on the site thought only a handful of people would turn up," he said.
"This shows there is a lot of opposition to what they are planning."
Some protesters were demonstrating against a lack of openness from the government over the project
Protesters ranged in age from the very young to more elderly people
Banking group UBS is the first firm to sign a pre-let agreement for office space on the former Esplanade car park site.
Senator Maclean said: "It is bad enough seeing front page articles talking about protests against the finance centre with thousands of people.
"That gets picked up internationally. What sort of impression does that give of this island as a whole? It does no good for any of us."
There was a petition on site and organiser Harry McRandle estimated there were already a few thousands signatures.
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